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authorMichael Neuling <mikey@neuling.org>2008-07-02 14:06:37 +1000
committerPaul Mackerras <paulus@samba.org>2008-07-03 16:58:11 +1000
commit6a274c08f2f4dfac7167bbd849621f3a2b55d424 (patch)
tree1bad45a11c1e436ffbcb84107783da0e423925f9 /arch/powerpc/kernel/signal_64.c
parent2d1b2027626d5151fff8ef7c06ca8e7876a1a510 (diff)
powerpc: Clean up copy_to/from_user for vsx and fpr
This merges and cleans up some of the ugly copy/to from user code which is required for the new fpr and vsx layout in the thread_struct. Also fixes some hard coded buffer sizes and removes a redundant fpr_flush_to_thread. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/signal_64.c')
-rw-r--r--arch/powerpc/kernel/signal_64.c43
1 files changed, 11 insertions, 32 deletions
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 8214e57aab67..93ebfb6944b6 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -89,10 +89,6 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
#endif
unsigned long msr = regs->msr;
long err = 0;
-#ifdef CONFIG_VSX
- double buf[FP_REGS_SIZE];
- int i;
-#endif
flush_fp_to_thread(current);
@@ -117,12 +113,9 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
err |= __put_user(0, &sc->v_regs);
#endif /* CONFIG_ALTIVEC */
flush_fp_to_thread(current);
+ /* copy fpr regs and fpscr */
+ err |= copy_fpr_to_user(&sc->fp_regs, current);
#ifdef CONFIG_VSX
- /* Copy FP to local buffer then write that out */
- for (i = 0; i < 32 ; i++)
- buf[i] = current->thread.TS_FPR(i);
- memcpy(&buf[i], &current->thread.fpscr, sizeof(double));
- err |= __copy_to_user(&sc->fp_regs, buf, FP_REGS_SIZE);
/*
* Copy VSX low doubleword to local buffer for formatting,
* then out to userspace. Update v_regs to point after the
@@ -131,17 +124,12 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
if (current->thread.used_vsr) {
flush_vsx_to_thread(current);
v_regs += ELF_NVRREG;
- for (i = 0; i < 32 ; i++)
- buf[i] = current->thread.fpr[i][TS_VSRLOWOFFSET];
- err |= __copy_to_user(v_regs, buf, 32 * sizeof(double));
+ err |= copy_vsx_to_user(v_regs, current);
/* set MSR_VSX in the MSR value in the frame to
* indicate that sc->vs_reg) contains valid data.
*/
msr |= MSR_VSX;
}
-#else /* CONFIG_VSX */
- /* copy fpr regs and fpscr */
- err |= __copy_to_user(&sc->fp_regs, &current->thread.fpr, FP_REGS_SIZE);
#endif /* CONFIG_VSX */
err |= __put_user(&sc->gp_regs, &sc->regs);
WARN_ON(!FULL_REGS(regs));
@@ -165,13 +153,12 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
#ifdef CONFIG_ALTIVEC
elf_vrreg_t __user *v_regs;
#endif
-#ifdef CONFIG_VSX
- double buf[FP_REGS_SIZE];
- int i;
-#endif
unsigned long err = 0;
unsigned long save_r13 = 0;
unsigned long msr;
+#ifdef CONFIG_VSX
+ int i;
+#endif
/* If this is not a signal return, we preserve the TLS in r13 */
if (!sig)
@@ -234,15 +221,9 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
else
current->thread.vrsave = 0;
#endif /* CONFIG_ALTIVEC */
-#ifdef CONFIG_VSX
/* restore floating point */
- err |= __copy_from_user(buf, &sc->fp_regs, FP_REGS_SIZE);
- if (err)
- return err;
- for (i = 0; i < 32 ; i++)
- current->thread.TS_FPR(i) = buf[i];
- memcpy(&current->thread.fpscr, &buf[i], sizeof(double));
-
+ err |= copy_fpr_from_user(current, &sc->fp_regs);
+#ifdef CONFIG_VSX
/*
* Get additional VSX data. Update v_regs to point after the
* VMX data. Copy VSX low doubleword from userspace to local
@@ -250,14 +231,12 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
*/
v_regs += ELF_NVRREG;
if ((msr & MSR_VSX) != 0)
- err |= __copy_from_user(buf, v_regs, 32 * sizeof(double));
+ err |= copy_vsx_from_user(current, v_regs);
else
- memset(buf, 0, 32 * sizeof(double));
+ for (i = 0; i < 32 ; i++)
+ current->thread.fpr[i][TS_VSRLOWOFFSET] = 0;
- for (i = 0; i < 32 ; i++)
- current->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i];
#else
- err |= __copy_from_user(&current->thread.fpr, &sc->fp_regs, FP_REGS_SIZE);
#endif
return err;
}